LU-6427 osd: race between destroy and load LMV

LU-6427 osd: race between destroy and load LMV

Do not get LMVEA if the object has been destroyed,
because it needs to iterate the master object, which
is dangerous for ZFS OSD.

Add oo_destroyed flags to avoid accessing destroyed
directory.

Add sanityn.sh 83 to verify accessing destroyed striped
directory will not cause panic.

Signed-off-by: wang di <di.wang@intel.com>
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I1ef6bf197eac0917fd649868235c96af2f64207c
Reviewed-on: http://review.whamcloud.com/14346
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>